Embedding Models: Contextual tokens code example crashes

When trying to execute the code example for lesson3, contextual tokens, there is a server fatal error. I’m running in the environment the course sets up. What do I need to do?

Addendum: Wait! it started working. This is confusing.

IOPub message rate exceeded.
The notebook server will temporarily stop sending output
to the client in order to avoid crashing it.
To change this limit, set the config variable
--NotebookApp.iopub_msg_rate_limit.

Current values:
NotebookApp.iopub_msg_rate_limit=1000.0 (msgs/sec)
NotebookApp.rate_limit_window=3.0 (secs)